5
Introduction
The PE MKII serie
The APEX PE MKII series combines a graphic equaliser section
with a parametric filter section. Wide-range Butterworth low and/or
high pass filters precede the equalisers for added versatility and
shaping of the response curve near the edges.
The heart of each graphic equaliser section is a bank of 30
bandpass filters at distinct ISO centre frequencies or one filter for
each 1/3 octave frequency.
Perfectly flat amplitude and phase response is obtained by using
our DLT thick film hybrid circuits which surpasses the results and
quality of discrete components.
DLT stands for Dynamic Laser Trimming: at the factory, each filter
of the graphic equaliser is adjusted for optimum 1/3 octave filter
centre frequency and bandwidth by means of a special developed
trimming algorithm. Adjusting the centre frequency and the
Incorporating all filter components on the hybrid circuits has the
advantage that the number of soldered connections is largely
reduced, boosting the reliability to an extent only exceeded by
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